diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index 624c8a5..e25d7a9 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -67,4 +67,5 @@
   - [Challenge 63](./challenges/challenge-63.md)
   - [Challenge 64](./challenges/challenge-64.md)
   - [Challenge 65](./challenges/challenge-65.md)
+  - [Challenge 66](./challenges/challenge-66.md)
 - [Resources](./resources.md)
diff --git a/src/challenges/challenge-66.md b/src/challenges/challenge-66.md
new file mode 100644
index 0000000..f3ccc68
--- /dev/null
+++ b/src/challenges/challenge-66.md
@@ -0,0 +1,42 @@
+# Challenge 66
+
+### Rust Tip: Using matches! Macro for Concise Pattern Matching
+
+The `matches!` macro checks if a value matches a pattern, returning a boolean without requiring a full match expression.
+
+It's ideal for concise conditionals, especially with enums or complex types, avoiding verbose pattern matching.
+
+```rust
+// Rust Bytes Issue 75: Using matches! Macro for Concise Pattern Matching
+
+#[allow(dead_code)]
+enum Status {
+    Active,
+    Inactive,
+    Pending(u32),
+}
+
+fn main() {
+    let statuses = vec![
+        Status::Active,
+        Status::Inactive,
+        Status::Pending(42),
+    ];
+
+    for status in statuses {
+        if matches!(status, Status::Pending(_)) {
+            println!("Found a pending status!");
+        } else if matches!(status, Status::Active) {
+            println!("Found an active status!");
+        }
+    }
+
+    // Example with more complex pattern
+    let value = Some(10);
+    if matches!(value, Some(x) if x > 5) {
+        println!("Value is Some and greater than 5!");
+    }
+}
+```
+
+You can play around with the code on [Rust Playground](https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=736aeb158cbf8013841d6c85ce6a3f58).